Alder pollen grain,coloured scanning electron micrograph (SEM). The pollen grain of the alder plant (Alnus) is highly allergic. It is transported by the wind,and so is light with a smooth,non-sticky surface to aid its dispersal over distances of thousands of kilometres. Pollen grains are reproductive structures produced by the male parts of flowering plants | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Oeggerli, Martin |
Bildgröße: | 3626 px × 4835 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |